| Forest Oil Corp | 100841 | — | 5 | 4 |
| Forest Oil Corporation | 100842 | Denver | 121 | 2 |
| Fortuna (US) Inc | 100843 | Calgary, Alberta | 0 | 0 |
| Fortuna (US) LP | 100844 | Warrendale | 6 | 3 |
| Fortune Oil LTD | 100845 | Salt Lake City | 2 | 1 |
| Fortune Petroleum Corp | 100846 | Van Nuys | 1 | 1 |
| Fossil Fuels Inc | 100847 | — | 3 | 1 |
| Foster Energy Group, LLCActive | 105102 | Dallas | 1 | 1 |
| Foundation Energy Management, LLC | 100848 | Addison | 18 | 2 |
| Four Boys Company | 100849 | — | 2 | 1 |
| Four Corners Energy, LLC | 104731 | Houston | 5 | 1 |
| Four D Oil Company | 100850 | — | 1 | 1 |
| Four Leaf Oil Inc | 100851 | Spring Valley | 0 | 0 |
| FourPoint Resources, LLCActive | 105580 | Denver | 982 | 2 |
| Foxfire Petroleum Corp | 100852 | — | 1 | 1 |
| Franciscan Oil Company | 100853 | Salt Lake City | 0 | 0 |
| Frazier Oil Co | 100854 | — | 0 | 0 |
| Freedom Energy Inc | 100855 | Lafayette | 2 | 1 |
| Freedom Oil & Gas Inc | 100856 | Salt Lake City | 0 | 0 |
| Friar Oil Co | 100857 | Magna | 0 | 0 |
| Frist Rock Inc | 100858 | Littleton | 0 | 0 |
| Frontier Drillling Co | 100859 | — | 2 | 1 |
| Fry, Lloyd A | 100862 | — | 1 | 1 |
| Fuel Explor Inc (Fuelex) | 100863 | — | 4 | 2 |
| Fuller, Kenneth & Marjorie | 100864 | — | 0 | 0 |
| Fuller, R J | 100865 | Dallas | 0 | 0 |
| Fulton Oil & Gas Inc | 100866 | — | 3 | 1 |
| Fulton, Mervin J & Assoc | 100867 | Tulare | 1 | 1 |
| Fusi LLC | 100869 | Calgary, Alberta | 0 | 0 |
| G C Bingham | 100870 | Odessa | 2 | 1 |
| G W E Co | 100871 | Park City | 1 | 1 |
| G-K Industries | 100872 | — | 2 | 1 |
| Gaedeke Oil & Gas Operating LLC | 100873 | Dallas | 1 | 1 |
| Gagon, Fred H | 100874 | — | 1 | 1 |
| Gallaway, W M | 100875 | — | 1 | 1 |
| Garner, Russell D | 100876 | — | 2 | 1 |
| Gary Energy Corporation | 100877 | Englewood | 0 | 0 |
| Gary Refining Co | 100879 | Englewood | 0 | 0 |
| Gary Williams Energy Corp | 100880 | Denver | 0 | 0 |
| Gas & Oil Management Inc | 100881 | Englewood | 1 | 1 |
| Gas Producing Enterprises | 100882 | Houston | 11 | 2 |
| Gasco Inc (GSC Oper) | 100883 | Lakewood | 0 | 0 |
| Gasco Production Company | 100884 | Englewood | 0 | 0 |
| Gasco Production Company | 100885 | Denver | 125 | 2 |
| Gavilan Petroleum Inc | 100886 | Park City | 4 | 1 |
| Gavilan Petroleum Inc | 100887 | Salt Lake City | 0 | 0 |
| GCRL Energy LTD | 100888 | Calgary, Alberta | 1 | 1 |
| Gelco Co | 100889 | — | 1 | 1 |
| Gem & Eye GP | 100890 | Moab | 0 | 0 |
| Gem Resources | 100891 | — | 1 | 1 |
| General American Oil of TX | 100892 | Dallas | 2 | 1 |
| General Atlantic Res Inc | 100893 | Denver | 0 | 0 |
| General Crude Oil Co | 100894 | Snyder | 3 | 2 |
| General Hydrocarbons Corp | 100895 | — | 0 | 0 |
| General Minerals Corp | 100897 | Oklahoma City | 0 | 0 |
| General Petroleum Corp | 100898 | — | 1 | 1 |
| Genesis Petroleum US, Inc | 100899 | Salt Lake City | 2 | 1 |
| Genesis ST Operating LLCActive | 100901 | Denver | 4 | 1 |
| Genesis ST Operating LLCActive | 100902 | Denver | 0 | 0 |
| Genisis Production Company | 100900 | Casper | 0 | 0 |
| Geochem Exploration LLC | 100903 | Casper | 0 | 0 |
| Geodyne Resources Inc | 100904 | — | 0 | 0 |
| Geokinetics Inc | 100905 | Salt Lake City | 0 | 0 |
| Geophysical Survey Company | 100906 | Grand Junction | 1 | 1 |
| Geotronic Development Co | 100908 | San Francisco | 3 | 2 |
| Gerrity Oil & Gas Corp | 100909 | Denver | 0 | 0 |
| Getty Oil Company | 100910 | Casper | 5 | 2 |
| Getty Trading & Trans Co | 100911 | Denver | 0 | 0 |
| Giant Explor & Prod Co | 100912 | Farmington | 25 | 1 |
| Giant Industries | 100913 | Farmington | 0 | 0 |
| Gibraltar Oil Co | 100914 | — | 1 | 1 |
| Gibson, W R Jr | 100915 | — | 4 | 1 |
| Gililland, Daymon D | 100916 | Spring Valley | 4 | 1 |
| Gilmore Oil and Gas Co | 100917 | Austin | 4 | 1 |
| Gladstone, Abraham R | 100918 | Englewood Cliffs | 0 | 0 |
| Glasco, L M | 100919 | — | 1 | 1 |
| Glna LLC | 100921 | Golden | 0 | 0 |
| Global Natural Res Corp | 100922 | Houston | 3 | 2 |
| Globe Minerals Inc | 100923 | — | 1 | 1 |
| Gmc Oil & Gas | 100924 | — | 1 | 1 |
| Goal Resources Inc | 100925 | — | 8 | 2 |
| Gold Bar Resources Inc | 100926 | — | 1 | 1 |
| Golden Eagle Exploration, LLC | 100927 | Moab | 0 | 0 |
| Goldsmith, Clifford | 100929 | — | 1 | 1 |
| Goldston Oil Corp | 100930 | — | 1 | 1 |
| Goody, F D | 100931 | — | 1 | 1 |
| Gordan Gray | 100933 | — | 1 | 1 |
| Gordon Creek, LLCActive | 100932 | Calgary | 13 | 1 |
| Gordon Oil Company | 100934 | Abilene | 2 | 1 |
| Gordy Oil Company | 100935 | Vernal | 1 | 1 |
| Gorringe, Ralph | 100936 | — | 0 | 0 |
| Gould, Wilburn J | 100937 | Chico | 5 | 1 |
| Gra*nd Water Disposal | 100938 | Altamont | 0 | 0 |
| Grace Petroleum Corp | 100939 | Oklahoma City | 1 | 1 |
| Grace, Corrine | 100940 | — | 2 | 1 |
| Graco Fishing & Rental TOO | 100941 | Vernal | 0 | 0 |
| Grafton Oil Company | 100942 | — | 1 | 1 |
| Graham Energy LTD | 100943 | Houston | 3 | 2 |
| Graham Resources Inc | 100944 | Denver | 2 | 2 |
| Graham Royalty LTD | 100945 | Denver | 1 | 1 |
| Graham Royalty LTD | 100946 | Houston | 0 | 0 |
| Graham, George W Inc | 100947 | Wichita Falls | 3 | 1 |
| Gralapp, Ben | 100948 | — | 1 | 1 |
| Grand County Oil Co | 100949 | Huntington Beach | 1 | 1 |
| Grand Oil and Gas Corp | 100950 | Eenglewood | 0 | 0 |
| Grand Pyramid Oil Inc | 100951 | — | 1 | 1 |
| Grand Resources | 100952 | Salt Lake City | 1 | 1 |
| Grand River Oil & Gas | 100953 | — | 2 | 1 |
| Granite Corporation | 100955 | Denver | 0 | 0 |
| Grant Bleazard Pit | 100956 | Mountain Home | 0 | 0 |
| Gray, Al | 100957 | — | 1 | 1 |
| Great Basin Petroleum Co | 100959 | Denver | 3 | 2 |
| Great Lakes Carbon Corp | 100960 | — | 2 | 1 |
| Great Lakes Natural Gas | 100961 | — | 1 | 1 |
| Great Northern Gas Company | 100962 | Denver | 0 | 0 |
| Great Western Drilling Co | 100963 | Farmington | 8 | 4 |
| Great Western Energy | 100964 | Duchesne | 0 | 0 |
| Great Western Petroleum | 100965 | — | 1 | 1 |
| GREEN NATURAL GAS VENTURES LLCActive | 105478 | La Sal | 0 | 0 |
| Green River Exploration | 100966 | — | 1 | 1 |
| Green River Operating LLC | 100967 | Red Oak | 2 | 1 |
| Green River Water Disposal LLC | 100968 | Red Lodge | 0 | 0 |
| Green, Billy J | 100969 | — | 2 | 1 |
| Greenwood Holding Inc | 100970 | Englewood | 6 | 2 |
| Greylock Production, LLCActive | 105251 | Charleston | 1,474 | 2 |
| Grindstaff, E C | 100971 | — | 1 | 1 |
| Gruenerwald, William | 100972 | Colorado Springs | 2 | 1 |
| Grynberg, Celeste C | 100973 | Denver | 3 | 1 |
| Grynberg, Jack J | 100974 | Denver | 5 | 2 |
| Guffey & Galey | 100976 | — | 1 | 1 |
| Gulf Energy Corporation | 100977 | Denver | 5 | 2 |
| Gulf Oil Corporation | 100979 | Denver | 166 | 14 |
| Gulf Oil Corporation | 100980 | Hobbs | 0 | 0 |
| Gulf Oil Explor & Prod | 100981 | Midland | 2 | 2 |
| Gulf Production Corp | 100982 | Oklahoma City | 0 | 0 |
| Gunnison Drilling Company | 100983 | — | 1 | 1 |
| Gunnison Oil Co Inc | 100984 | Salt Lake City | 2 | 1 |
| Gusher Field Co | 100985 | — | 1 | 1 |
| GW Petroleum Inc | 100986 | Houston | 2 | 1 |
| GWR Operating Company | 100987 | Houston | 0 | 0 |
| H & A Oil Co | 100988 | — | 4 | 1 |
| H K Bartlett Et Al | 100989 | Dallas | 2 | 1 |
| H M Byllesby & Company | 100990 | — | 2 | 1 |
| Hadden & Harrison | 100991 | Vernal | 0 | 0 |
| Hadden, Darrel | 100992 | Vernal | 0 | 0 |
| Hadden, Pennell & Rohret | 100993 | Lakewood | 1 | 1 |
| Hagen | 100994 | — | 1 | 1 |
| Halbert & Jennings | 100995 | Denver | 1 | 1 |
| Halcon Energy Properties Inc | 100996 | Littleton | 0 | 0 |
| Halcon Field Services LLC | 100997 | Littleton | 0 | 0 |
| Halcon Operating Inc | 100998 | Littleton | 0 | 0 |
| Hallwood Petroleum Inc | 100999 | Denver | 1 | 1 |
| Hamilton Brothers Oil Co | 101000 | Denver | 2 | 2 |
| Hamon Operating Company | 101001 | Dallas | 7 | 5 |
| Hancock, Burton W | 101002 | Morrison | 22 | 1 |
| Hancock, Quentin | 104354 | Morrison | 0 | 0 |
| Hancock-Utah Development | 101003 | — | 1 | 1 |
| Hansen Disposal | 101005 | Duchesne | 0 | 0 |
| Hanson Oil Corp | 101006 | Roswell | 4 | 2 |
| Harken Southwest Corp | 101007 | Houston | 121 | 1 |
| Harper Oil Company | 101008 | — | 3 | 1 |
| Harrison, Thomas D | 101009 | Park City | 5 | 1 |
| Harvest (US) Holdings, Inc | 101012 | Houston | 1 | 1 |
| Harvey, M J Jr | 101013 | Dallas | 7 | 2 |
| Hathaway/Glasco | 101014 | Santa Fe Spring | 3 | 1 |
| Havenstrite Oil Co | 101015 | Los Angeles | 0 | 0 |
| Hawkins, Woodworth | 101016 | — | 1 | 1 |
| Hawks Company LP | 101017 | Casper | 0 | 0 |
| Hawks Industries Inc | 101018 | Casper | 0 | 0 |
| Hay Hot Oil Inc | 101019 | Montezuma Creek | 2 | 1 |
| Headington Minerals | 101020 | Dallas | 0 | 0 |
| Headington Oil Company | 101021 | Dallas | 0 | 0 |
| Heavy Sweet Oil, LLCActive | 105334 | Woods Cross | 10 | 1 |
| Hedge, Glen M | 101022 | Longview | 1 | 1 |
| Hedges Oil Company | 101023 | Casper | 0 | 0 |
| Helbing & Podpechan | 101024 | Clarence | 1 | 1 |
| Held By Production Inc | 101025 | Roosevelt | 0 | 0 |
| Hep Partners LP | 101026 | Midland | 0 | 0 |
| Hershey Oil | 101027 | Pasadena | 1 | 1 |
| Hewitt Operating, Inc | 101028 | West Point | 0 | 0 |
| Hewitt, William D | 101029 | — | 2 | 1 |
| Hexadyne Energy Corp | 101030 | Woodland | 1 | 1 |
| Hi-Gravity Petro & Dev Co | 101031 | — | 1 | 1 |
| Hiawatha Exploration Co | 101032 | — | 1 | 1 |
| Hiawatha Oil & Gas Co | 101033 | — | 1 | 1 |
| Hickey Oil Corp | 101034 | — | 4 | 2 |
| Hicks Oil & Gas Inc | 101035 | Farmington | 1 | 1 |
| Hicks, Louise | 101036 | Cortez | 5 | 1 |
| High River Resources Operating, LLCActive | 105853 | Dallas | 0 | 0 |
| Highland Energy Company | 101037 | Dallas | 0 | 0 |
| Highland Resources Inc | 101038 | Houston | 0 | 0 |
| Hiko Bell Mining & Oil Co | 101039 | Vernal | 5 | 1 |
| Hill, A G | 101040 | — | 0 | 0 |
| Hill, Gillman A | 101041 | Englewood | 2 | 1 |
| Hill-Hart Inc | 101042 | Englewood | 0 | 0 |
| Hilliard Oil & Gas Inc | 101043 | — | 1 | 1 |
| Hillstrom, Bryan | 101044 | New York | 0 | 0 |
| Hinto Energy Inc | 101045 | Edwards | 7 | 1 |
| Hixon Development Co | 101046 | Farmington | 0 | 0 |
| HJG Utah, LLC | 101047 | Duchesne | 0 | 0 |